I started getting emails from asmallworld.net, one of the social networks I belong to prompt activity. Status updates, activity updates etc. They didn't used to send those. I don't like it, it feels like spam. So why did they start? Weren't they growing just fine without it? Could be, but pretty much everybody I know there, is now on Facebook and that's where I connect with them. They don't show up on Comscore but here is their last years Alexa graph.
You have to take Alexa with a grain of salt, but it says their pageview are half of what they used to be before Facebook opened its platform. I wonder what other social networks are feeling the same pinch?